Profiling diamond



Jan. 24, 1939.

R. sTbPP PRQFILING DIAMOND Filed June 25, 1937 Patented in; 24!, low

U ITED STATES 'PA E 1* omen:

Application June 25, In Germany 19:7, Serial No. 150,423 August is, 1 36 3 Claims. (61. lee-a9) The present invention relates to profiling diahands for cutting profiles in a. rotating grinding wheel, especially in a grinding wheel for the grinding of screw-threads.

The object of the invention is to provide an improved profiling diamond which is more economical in use and at the same time more emcient.

The known profiling diamonds comprise a polished cutting edge formed to correspond to the profile of the groove to be produced in the grind.-

ing wheel. The cutter front is ground under a certain free angle to the surface to be dressed of the grinding wheel. The profiling diamond is embedded or clamped in a holder, fixed in a device which allows the tool tobe moved radially and parallel to the surface of the grinding disc. As the diamond only has a single profile cuttingg. its utilization is comparatively unsatisfac.-:

According to the present invention the dia-- diamond, being twice that of the latter with a- 30 diamond of uniform crystal structure;

The double cutting profiling diamond has furthermore a much stronger form than the single edge cutter so that greater stress can be applied, and it is therefore more efilcient.

'35 Suitably the profiling diamond is placed in a holder of rectangular cross section in such a manner thattwo opposite holder surfaces run parallel to the cutting surfaces and serve as supporting surfaces. One of the lateral surfaces of 40 theholder is laid against [an abutment surface of the device and the holder is clasped. The profiling diamond is thenexactly in the desired position with respect-tothe circumferential surface of the grlndihg wheel.

' tion by turning the diamond holder about 180.

According to a further constructional form, the dismondholder is arranged to be rotatable in a support. which is adjustable in a plane 'disso poled parallel to the working. position of the cut? ting surface. This second movement is exclusively utilised for settingthe tool, while the rotatable arrangement is alsontilined for turning the diamend lder ordertochangethecuttingedse.

II In order that the'present'inventionmay be The other cutting I edge can then be brought into the operative posireadily-understood, some constructional forms of the invention are illustrated inthe drawing,- inwhich Figure 1 shows the profiling diamond, Figure 2 shows it during penetration into the 5 grinding wheel, Figure 3 illustrates a suitable setting position with regard to the grinding wheel, Figures 4 and 5 are end' views of two constructional examples of dressing devices which are 10 equipped with the new diamond, and Fig. 6 is a fragmentary horizontal section of. Fig. 5.

The profiling diamond ishown in Figures 1 and 2 is for example intended for profiling a 1 grinding wheel S for the grinding of pointed screw-threads (Whitworth screw-threads). Accordingly, the cutting edges I and l of equal size, arranged opposite each other according tothe. present invention, have a triangular shape with 20 rounded tips. The cutting surfaces are disposed in parallel-planes (normal profile planes). The wedge angles of the cutters are then 90'.

The profile of the cutters can of coursealso have a different shape; for example it can be of trapezoidal shape in'order to cut grinding discs for the grinding of trapezoid screw threads. 7

The diamond isso adjusted in the holder or the holder is so prepared according to the diamond that the surface I of the holder 2 (Flgure -1) is parallel to the cutting surface I of the diamond and the holder surface 2" is parallel to the cutting surface l During use of the cutting edge I the holdersurfa'ce 2' serves and during the use of the cutting edge-i the holder surface 2' serves as supporting surface. The lateral surfaces 2 and 2 respectively serve as abutment surfaces'which co-operate with a counter abutment on the device. ;In the device according to Figure 4 the'counter abutment is formed from 40 one edge of the cross slide 3, on which the penetrating tool is rigidly clamped, for example by means of a clamping screw 4 and aclamping iron 5. However setting screws or the like can also be provided as counter abutments. The cross it slide 3 is adjustable on the lower slide I by means of a screw spindle 1,. .so that thetool can move in the direction of the arrow :r radially to the grinding wheel 8 and penetrate into it. The depthof the'profileis determinedthroughastop i0 device (not shown) or withthehelpofameasuring-drum (not shown) located on the setting spindle -I. When'the prolile hasheen cut the slidelandtherewiththetoolhlatedrawnback andthelowerslideiisdisplaoedmthedirection'iof the arrow 3; along the grinding disc S by the amount of its groove pitch on guides of the frame H). The actuation of the lower slide 5 can, for example, be efiected by means of a screw-spindle, not shown, in accordance with a dividing disc 8 r from a dividing crank 9. After displacement by one divisional step the penetration of the next profile groove in the grinding wheel takes place, and so on until all the profiles are produced.

In the same manner worn grinding wheel profiles are renewed by re-cutting. If the one diamond cutting edge has become spoilt, by turning the holder 2 about 180 the other cutter is brought into the operative position. The diamond tool may be adjusted to the centre of the grinding wheel; suitably however, as shown in Figure 3 it is disposed below the centre of the grinding Wheel so that a free angle results. The profile of the diamond in this case is modified to. correspond to this setting position. In the device shown in Figures 5 and 6 the diamond is secured in a holder 2' of circular cross section; The holder 2 is accommodated in a support it rotatable about a horizontal axis. The support is connected with a rocking plate l2 which is arranged on the cross slide 3 so as to be adjustable about a vertical axis 13 in a plane parallel to the operative position of the cutting edge and is rigidly clamped by means of the screws Hl. Through this arrangement the cutting edge of the diamond can in a erence to the model diagram of an optical observation apparatus. By rotating the holder 2' about 180 in the support it the other cutting edge is brought into the operative position. This position of the holder 2 is locked through a jamming cam I5.

I claim:

simple manner be adjusted with ref-.

1. In a profiling diamond having two cutting edges comprising a pair of surfaces of the same shape oppositely disposed to each other, the said surfaces being interchangeably operative when the diamond is turned about 180, a holder for the diamond rectangular in cross section, said holder having parallel abutment surfaceavsaid surfaces of said holder being parallel to said cutting edges of the diamond, a supporting mount for said holder, said mount'providing a plane surface adapted to engage an abutment surface of said holder, and means for attaching said holder to said mount.

2. In a profiling diamond having two cutting edges comprising a pair of surfaces of the same shape oppositely disposed to each other, the said surfaces being interchangeably operative when the diamond is turned about 180, a holder for the diamond rectangular in cross section, the said surfaces of said holder being parallel to said cutting edges of the diamond, a device having an L-shaped abutment against which a corner of the holder is fitted for properly positioning the holder thereon, and means for retaining the holder and device assembled.

3.-A profiling diamond, said diamond being wedge-shaped and having parallel wedge-shaped end surfaces, said end surfaces comprising oppositely disposed cutting edges, and a holder for said diamond, said holder having an abutment surface thereon, said end surfaces of said diamond being parallel to said surface of said holder, and a supporting mount for said diamond and holder, said mount including a. supporting surface adapted to engage said abutment surface of said holder, and means for removably attaching said holder to said mount.

ROBERT STOFP. 

